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RF exposure report

Shenzhen Auto-vox Technology Co., Ltd. WF1 Backup Camera IK4-WF1 IK4WF1 wf1

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Document DEVICE REPORTGetApplicationAttachment.html?id=8197279 
FCC ID: IK4-WF1

RF Exposure Evaluation
Limits

The criteria listed in the following table shall be used to evaluate the environment impact of human exposure to radio frequency (RF) radiation as specified in 1.1307(b)

Limits for Maximum Permissible Exposure (MPE)

Frequency range (MHz)

Electric field strength (V/m)

Magnetic field strength (A/m)

Power density (mW/cm2)

Averaging time (minutes)

(A) Limits for Occupational/Controlled Exposures

0.3­3.0

614

1.63

*(100)

6

3.0­30

1842/f

4.89/f

*(900/f2)

6

30­300

61.4

0.163

1.0

6

300­1500

f/300

6

1500­100,000

5

6

(B) Limits for General Population/Uncontrolled Exposure

0.3­1.34

614

1.63

*(100)

30

1.34­30

824/f

2.19/f

*(180/f2)

30

30­300

27.5

0.073

0.2

30

300­1500

f/1500

30

1500­100,000

1.0

30

f = frequency in MHz Friis transmission formula: Pd = (Pout*G)/(4*pi*r2)

Where Pd = power density in mW/cm2, Pout = output power to antenna in mW; G = gain of antenna in linear scale, Pi = 3.1416; R = distance between observation point and center of the radiator in cm

Pd id the limit of MPE, 1 mW/cm2. If we know the maximum gain of the antenna and the total power input to the antenna, through the calculation, we will know the distance r where the MPE limit is reached. Test Procedure Software provided by client enabled the EUT to transmit and receive data at lowest, middle and highest channel individually.

Test Result of RF Exposure Evaluation

WiFi mode Mode
802.11b

Output power to antenna
(dBm)
10.85

Tune-up Power(dBm)

Max Tune-up Power(dBm)

10(±1)

11

Output power to antenna
(mW)
12.59

Power Density at R=20cm (mW/cm2)
0.0061

Limit Result
(mW/cm2)

1.0

PASS

Remark: antenna gain= 3.9dBi

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